坐骨神经痛最常见的病因是（）
A.神经根炎
B.急性脊髓炎
C.脊柱炎
D.腰椎间盘突出
E.马尾瘤
参考答案：D
把下列句子翻译成汉语。
1. In China, years have names.
___________________________________
2. How many animals are there?
3. What was last year?
_____ she got a dictionary?
A．Does
B．Has
C．Have
D．Do
